Your save files will still work, but you will need to make sure the game knows about them by having them in the correct folder. If you extract the next update into an entirely new folder, then you would need to move the save files from the older update into the new one. Can just extract the new files into where the game is saved and it'll update the necessary files while keeping the save files in place. This is assuming PC; if you're on Android then you shouldn't have to worry about it.